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An S-Band Reflection-Type Phase Shifter - A Design Example Using Ferroelectrics

Published online by Cambridge University Press:  01 February 2011

Dongsu Kim ,
Yoonsu Choi ,
Mark G. Allen ,
J. Stevenson Kenney ,
David W. Stollberg  and
David Kiesling
Dongsu Kim
Affiliation:
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, U.S.A.
Yoonsu Choi
Affiliation:
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, U.S.A.
Mark G. Allen
Affiliation:
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, U.S.A.
J. Stevenson Kenney
Affiliation:
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, U.S.A.
David W. Stollberg
Affiliation:
MicroCoating Technologies, Inc. Chamblee, GA 30341, U.S.A.
David Kiesling
Affiliation:
MicroCoating Technologies, Inc. Chamblee, GA 30341, U.S.A.
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Abstract

One of the challenges faced in using ferroelectrics in high frequency devices is how to effectively use the material in a circuit design. A compact reflection-type phase shifter fabricated on sapphire substrates coated with ferroelectric barium strontium titanate (BST) thin-films has been built which shows the promise of using BST thin films in the design of tunable microwave devices. The phase shifter, fabricated as one monolithic assembly, consists of a 3dB coupler, meandered line inductors and tunable interdigital capacitors. A continuously variable phase shift range of more than 100° using the branch-line coupler was obtained at a center frequency of 2.95 GHz, and more than 90° phase shift over 200 MHz bandwidth with a bias voltage range from 0 V to 175 V. The phase shifter using the Lange coupler has over 700 MHz bandwidth centered at 2.2 GHz with a phase shift of more than 90° and an insertion loss less than 2 dB and return loss of greater than 14 dB, over a bias voltage range from 0 V to 160 V. The loss of the BST phase shifter presented in this work is on the order of other commercially available RF front-end components, such as bandpass filters and RF switches. This holds promise for the practical realization of smart antenna systems in cellular handsets and wireless LAN cards.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 720: Symposium H – Materials Issues for Tunable RF and Microwave Devices III , 2002 , H5.3
Copyright
Copyright © Materials Research Society 2002

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References

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